Where can I find the VIN on a older Pop-up camper?

Question

I bought a frame of a Pop-up camper and there was nothing left except the frame. It has now been turned into a trailer for my amusement company. I'm trying to find the VIN so i can register and insure it, but the only place it is posted is on the front of the frame and it is now unreadable since it was hit with the grinder when we painted the frame. Is there anywhere else it could be posted? All that I can read is ATWOOD on the frame.

Answer 1

Just register it as a homemade trailer........

Answer 2

That's the only spot on the frame.  They usually have one on the door opening as well, but it sounds like you don't have access to that.